Add file metadata TagSharedByCount and TagSharedByGeoIP

File Metadata.go

@@ -14,13 +14,15 @@ import (
 	"time"
 )
 
-// List of defined file tags.
+// List of defined file tags. Virtual tags are generated at runtime and are read-only. They cannot be stored on the blockchain.
 const (
-	TagName        = 0 // Name of file.
-	TagFolder      = 1 // Folder name.
-	TagDescription = 2 // Arbitrary description of the file. May contain hashtags.
-	TagDateShared  = 3 // When the file was published on the blockchain. Cannot be set manually (virtual read-only tag).
-	TagDateCreated = 4 // Date when the file was originally created. This may differ from the date in the block record, which indicates when the file was shared.
+	TagName          = 0 // Name of file.
+	TagFolder        = 1 // Folder name.
+	TagDescription   = 2 // Arbitrary description of the file. May contain hashtags.
+	TagDateShared    = 3 // When the file was published on the blockchain. Virtual.
+	TagDateCreated   = 4 // Date when the file was originally created. This may differ from the date in the block record, which indicates when the file was shared.
+	TagSharedByCount = 5 // Count of peers that share the file. Virtual.
+	TagSharedByGeoIP = 6 // GeoIP data of peers that are sharing the file. CSV encoded with header "latitude,longitude". Virtual.
 )
 
 // Future tags to be defined for audio/video: Artist, Album, Title, Length, Bitrate, Codec
@@ -43,9 +45,18 @@ func (tag *BlockRecordFileTag) Text() string {
 	return string(tag.Data)
 }
 
+// Number returns the tags data as uint64. It returns 0 if the data cannot be decoded.
+func (tag *BlockRecordFileTag) Number() uint64 {
+	if len(tag.Data) != 8 {
+		return 0
+	}
+
+	return binary.LittleEndian.Uint64(tag.Data[0:8])
+}
+
 // IsVirtual checks if the tag is virtual.
 func (tag *BlockRecordFileTag) IsVirtual() bool {
-	return tag.Type == TagDateShared
+	return IsTagVirtual(tag.Type)
 }
 
 // TagFromDate returns a tag from date
@@ -60,3 +71,21 @@ func TagFromDate(Type uint16, Date time.Time) BlockRecordFileTag {
 func TagFromText(Type uint16, Text string) BlockRecordFileTag {
 	return BlockRecordFileTag{Type: Type, Data: []byte(Text)}
 }
+
+// TagFromNumber returns a tag from a number
+func TagFromNumber(Type uint16, Number uint64) BlockRecordFileTag {
+	var tempDate [8]byte
+	binary.LittleEndian.PutUint64(tempDate[0:8], Number)
+
+	return BlockRecordFileTag{Type: Type, Data: tempDate[:]}
+}
+
+// IsTagVirtual checks if the tag is a virtual one.
+func IsTagVirtual(Type uint16) bool {
+	switch Type {
+	case TagDateShared, TagSharedByCount, TagSharedByGeoIP:
+		return true
+	default:
+		return false
+	}
+}